fix(input): handle kitty shift-tab in settings

[akbash-bot]

Summary

• canonicalize Kitty-style Tab + Shift before Settings section dispatch
• keep plain Tab moving forward while Shift+Tab moves backward
• cover the raw Kitty sequence through the Settings state transition

Checks

• cargo test app::input::settings::tests::kitty_shift_tab_moves_to_previous_settings_section -- --exact --nocapture
• cargo test app::input::settings::tests -- --nocapture
• just ci 'all() - test(live_server_holds_one_pty_master_fd_per_pane)' (3333 tests passed; the excluded harness requires target/debug/herdr inside the checkout, while Kennel supplies an isolated external CARGO_TARGET_DIR)
• just windows-lint
• maintenance unittest suite (98 passed)

refs #2556

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e4bc6dd7-ec3f-4072-b9b8-67c9d5162002

📥 Commits

Reviewing files that changed from the base of the PR and between d277d2f and 1eed66b.

📒 Files selected for processing (2)

• docs/next/CHANGELOG.md
• src/app/input/settings.rs

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📝 Walkthrough

Walkthrough

Settings key handling now dispatches normalized key codes across all sections. A regression test verifies Kitty keyboard protocol Shift+Tab navigation from Indicators to Theme. The changelog records the fix.

Changes

Settings navigation

Layer / File(s)	Summary
Normalized settings key dispatch src/app/input/settings.rs, docs/next/CHANGELOG.md	update_settings_state uses normalized key codes for settings-section handling. The regression test verifies Shift+Tab navigation from Indicators to Theme. The changelog records the fix.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• herdrdev/herdr#2340: Both PRs modify Kitty protocol keyboard handling in different input components.
• herdrdev/herdr#2479: Both PRs address Shift-key handling for Kitty keyboard protocol input.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: fixing Kitty Shift+Tab handling in Settings.
Description check	✅ Passed	The description directly explains the input-handling change, navigation behavior, tests, and related issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch akbash/2556-shift-tab-settings

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[affanali2k3]

LGTM. Checked and it works